Oh. That's because the start is the hardest part to get perfect without a really good queue. It's a lot easier to start playing earlier and keep time compared to starting at the exact right moment.
The music in the ad starts playing in the middle, but to coordinate timing the player actually starts earlier so that they are sync'd with the tempo of the song from the start. Since the music is layered on top of the video, if the tempo isn't perfect you will see errors in the playing. Hence the actor starts early to make sure he is on beat with the metronome, which the audio is later sync'd to.
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u/Glaselar Dec 12 '20
Which is exactlywhy it's confusing that he's playing from the very start, since OP said the music comes in when the camera reaches the middle